How to fix the File Explorer sidebar missing issue?
Why does this issue happen on Windows?
you’re able to follow them one by one to see if the issue can be fixed.
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File Explorer Sidebar Missing
Is yourFile Explorersidebar or left pane missing?
Most people run into this issue after theWindows update.
For detailed solutions, you’re able to read the next part.

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Step 1: Right-tap on the taskbar and chooseTask Managerfrom the list.
Step 2: Locate and right-click onWindows Explorerand clickRestartfrom the menu.

After that, you’ve got the option to test whether the File Explorer left pane appears.
How to fix Windows Explorer needs to be restarted problem?
This post tells you several methods to solve it.
Step 1: InputCommand Promptin Search and chooseRun as administratorfrom the list.
Step 1: Open Windows Explorer by pressingWin + Rand clickViewfrom the top.
Step 2: ChooseShowfrom the drop-down list and check the option ofNavigation pane.
Then you’ve got the option to shut the window and re-launch it.
Step 1: Open File Explorer and go to theViewtab from the top menu bar.
Step 2: ChooseNavigation paneand then tick the option ofNavigation pane.
In this way, you might choose to re-register the shdocvw.dll file to fix the File Explorer sidebar missing.
Step 1: typeCommand Promptin the search bar and chooseRun as administratorfrom the menu.
Step 2: ClickYeswhen a prompt pop up to ask for your confirmation.
Hope this article is useful for you.